I once smoked a jay with my friend before going to play guitar with our little "band". It's not really a band, just some friends who like to get together and jam sometime.. But anyway, he drums and he couldn't drum for shit. He kept falling over and laughing and we got this other kid to play. We were playing dani california and I couldn't remember the solo for the life of me. I started to play some random notes and started laughing. Nobody was really mad because they all knew we were high, but it was embarrassing nonetheless.

However, I find if I start playing guitar for a while.. Ten minutes or so (enough to get into it), and THEN I toke, I can play pretty much fine.. A little more creative on the soloing end as well..